"sum" is not specific enough a keyword to filter down the discussions. None
of the titles of the "Mathematically incorrect answers" list on Trac are
obviously about this issue, but is it new?
Code:
s, n, x, y, t = var('s, n, x, y, t')
print(sum(binomial(n,s) * (x+y)^s * x^(n-s), s, 0, n))
print(sum(binomial(n,s) * (x+1)^s * x^(n-s), s, 0, n))
Observed in version 9.4 using sagecell.sagemath.org:
(2*x + y)^n
(2*x)^n
Expected:
(2*x + y)^n
(2*x + 1)^n
Link to
reproduce:
https://sagecell.sagemath.org/?z=eJyFjEEKg0AQBO-Cf-ibM2Yi-gC_IqxBwkJ2Ijsq6-9dghcPklM3TVWbe09N8PZqRqc6xTOIy6IsTKCCJNgFC3psLlJ1GasfN0evC9kaaPT6Dd59SMUYNSg9dh4stzSQPo0F2W_zBfMfr7vzDlIMMqI=&lang=sage&interacts=eJyLjgUAARUAuQ==
Regards,
Peter Taylor
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